Prefer IParsable over Convert

[Seb-stian]

For a long time now, it was preferable to use int.Parse(string) over Convert.ToInt32(string). If you look at the implementation of ToInt32, you can see that it internally calls int.Parse(string), BUT returns 0 when input is null. This behaviour is rarely desirable. Even better than Parse is TryParse, since it is cleaner and performs better than handling exceptions with try catch. Parse is of course better when it comes to writing a simple code snippet for a lecture.

In modern .NET (version 7+) there is IParsable<TSelf> interface that reinforces the suggested pattern even further.

My suggested changes are to reflect these facts in lecture notes (and in related code examples).

The only relevant code example I could find with VS search was in CodeDemonstrations.cs:

Console.WriteLine("Waiting for input (number)...");
int input = Convert.ToInt32(Console.ReadLine());
Console.WriteLine($"Input: {input}");

So that's not too bad, but the lack of it in lecture notes is worse.

[pluskal]

Nice catch. Feel free to add PR with change to the place you feel is appropriate.